A Sadhu or a Hindu holy man gets his eyes tested at a free eye-care camp at a makeshift shelter before heading for an annual trip to Sagar Island for the one-day festival of "Makar Sankranti", in Kolkata, India, January 10, 2019. REUTERS/Rupak De Chowdhuri

A Sadhu or a Hindu holy man gets his eyes tested at a free eye-care camp at a makeshift shelter before heading for an annual trip to Sagar Island for the one-day festival of "Makar Sankranti", in Kolkata, India, January 10, 2019. REUTERS/Rupak De Chowdhuri